test: write specs that test behavior

Author: colbywhite

package-lock.json

@@ -53,6 +53,7 @@
 		"@octokit/webhooks-types": "7.6.1",
 		"@stoplight/json-schema-tree": "4.0.0",
 		"@tailwindcss/postcss": "4.1.4",
+		"@testing-library/dom": "10.4.1",
 		"@types/hast": "3.0.4",
 		"@types/he": "1.2.3",
 		"@types/mdast": "4.0.4",
@@ -81,6 +82,7 @@
 		"github-slugger": "2.0.0",
 		"globals": "16.4.0",
 		"gray-matter": "4.0.3",
+		"happy-dom": "20.8.9",
 		"hast-util-heading-rank": "3.0.0",
 		"hast-util-select": "6.0.4",
 		"hastscript": "9.0.1",